Wifi connection issue

Hi, I have a Gopigo3 robot with DexterOS. I decided to change OS because I had to use the tweeter function. To do this, I had to install Raspbian OS and I configured the network card to connect to the wifi of my phone. Everything works perfectly but when I decide to reuse Dexer OS contained on another SD card, the robot no longer emits wifi and a green LED flashes indefinitely.
I absolutely need to be able to connect with Dexter’s old OS without reinstalling it on the SD card because I need to recover programs from it.
Thank you in advance for your answer.